Conversation

TiL that while primary endosymbiosis, which originated the plastids and the mitochondria, happened only once, secondary endosymbiosis happened several types, giving rise to many different, unrelated groups of algae that got their plastids by engulfing other eukaryotes that had engulfed bacteria!

https://en.wikipedia.org/wiki/Symbiogenesis
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1ffk1db/til_that_while_primary_endosymbiosis_which/